After 4 days stuck at 300-400 elo i have finally reached 500 elo.
My tips in case you're stuck at 200-400 elo. Just keep doing puzzles daily, analyze the matches you lost and play them again vs a bot, learn one opening for white and one for black, not too deep just the basics or the first few moves and 15|10 matches another thing that i did but I'm not sure if it works is dual n back exercise.
Below 1k I think doing puzzles is important to not blunder. And it can be hard to remember to blunder check every move so doing puzzles will help you see hanging pieces and mates easier. Anyways, nice job.
500 Elo after 4 years... Obviously old school study and training with books and board works much better than online puzzles and engine analyze. Got me a first rating at nearly 1500 Rapid back in the days... And I'm no genius.