I know how frustrating it can be to look for a solution and nobody helps. I am not an expert on pixel art, actually, usually I am the one who makes the questions but I've seen many people asking about walk cycles so I can give some tips.
Larger pixel ratios takes too much time, if you are a beginner I think your sprite size is ok. Small px ratios are easier but I dont think this helps (personal opinion). If you keep working on your sprites the way they are you will get better and in the future you probably will remake them all, I keep doing this unfortunately.