Someone said to take breaks, which is very true. In rapid if you have momentum going with a win streak, keep playing until you lose two, (that worked for me) and if you lose two in a row its time to go into tilt prevention mode and take a break for a bit. In blitz chess this could change to around 4 games but you can keep it at 2 if you really wanna protect that Elo.
I've lost almost 100 in 3 days. What should I do?
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Why do you care about rating points? Simply looking at your low number is holding you back.