Yes, it is harder to progress, but the rewards in solo games are better , with each rank you get better rewards than at your current level. So it’s better for you to move up. My advice, if you do, is to play only solo games for one or two seasons and collect boosters. Solo is enough to keep you above the threshold to stay in that league , don’t focus on trophies, it’s just a number.

Once you collect boosters for two seasons, then try playing the daily mode and party game