SoPo, though it does kind of impairs you because you have half your power without Nana, is actually decent for punisher Ice Climbers. With you now being Solo, you can now use your tactics more liberally such as shielding and spotdodging (no longer you have to worry Nana getting hit, she is out of the picture). If you use Jab to start combos, nair to break being comboed, and Downsmash to punish people who approach you recklessly when you were spotdodging or shielding (Downsmash, if they are behind you after doing an aerial approach or rolling behind you, will wreck them because the first hit carries them to the second hit, which makes a total of around 20%, more than whan fsmash does while covering both sides with this insane hitbox.). The only problem people have when Sopoing is that they are too wreckless at getting hit. Since you are usually going to be at high percentages when in this state, it is optimum that you don't do laggy moves like fsmash and upsmash and other moves with relatively small hitboxes and punishable lag. People have to learn not to SH their blizzards anymore and learn to not use blizzard as an attack but only as a rushing attack approach stopper (if you attack with blizzard, SH or not, while the opponent can shield and roll behind, you put yourself into a vulnerable state). If you use it while they are trying to attack you, you are most likely going to stop them and not get punished since they are being occupied by your attack. Also, avoid using it in the air because it is laggy and easy to get behind and punish. It is better if they are rushing at you in the air than on the ground when doing blizzard because blizzard's solo strength doesn't shield poke as much as doubled and since the opponent can't shield in the air, it is better as an anti aerial defense. Use shielding or spotdodging to d-tilt if they approach on the ground or land in front of you after attempting to attack your shield because it comes out fast and ends quickly while doing a semi-spike when connecting making this an optimum move for punish. Use F-tilt as your more preferable "kill move" but only use the side or up smash as a kill move when they are at an appropriate percent to actually kill. Some players tend to smash early in percents when it wouldn't kill the opponent, only causing damage. F-tilt will work better for that kind of move in this situation since it has better range, comes out as fast, and does only slightly less knockback, but has less ending lag. Also when solo, it's more safe to stay on the ground even if there are comboing opprotunities higher in the air because you are more likely to hit them on the ground then in the air where they can aerial dodge and punish from below (the Ice Climber's psuedo blindspot, since dair does nothing to a shield). Learn to fight backwards most of the time so that you can pull of a downsmash or bair frequently since they are excellent moves and learn to walk instead of running so that you will be able to smash or pivot at any time since running doesn't go much faster and usually wouldn't be used unless you are running away since you are at the defensive.
Sorry that this is a bit lengthy, it's just that many people who end up SoPoing rely on smashes and laggy blizzards as damage and end up getting punished that way.
So yeah, in conclusion, DON'T SUICIDE. It MAY be bad for your health...