lemme look
What % of Games Have You Won?
If you win way more than 50% you are not at your rating level yet. When you reach your own rating level, it will be hard to keep even 50% wins because there are also draws in there.
If you keep more than 50% forever, either you quit before you got to your rating or there is something fishy going on (let’s just put it that way).

how can you tell?
Go to "Archive", then change the showed games to "wins", and then to "losses". Pick whichever one is lower first and then divide the two numbers by each other. (I.e., I have 498 wins and 738 losses. I choose "wins" first and put "498" into a calculator. Then divide that number by the bigger number. You will get a decimal and convert that into a percentage.)

I have won 77% of my games.
Nice, but if someone were to play people around their rating all the time, then they should win about half the time and lose about half of the time. That is just the math of how the ratings should work; if you are winning more than 50% (as 77% surely is), then you must be going up in rating, or playing many people much lower rated than yourself (and therefore, not gaining as many rating points per game).
I just checked my rapid all-time stats and apparently I win about 53% of the time. I hope that 3% away from 50% indicates that I'm going up in rating

Won 23. Lost 22. Under active investigation for cheating. Explain that
Unusually high accuracy?

He was joking.

Won 23. Lost 22. Under active investigation for cheating. Explain that
Unusually high accuracy?
I have investigated your account and the games it shows your accuracy on when you won are above 80, one even being 95. This is extremely high for a 500. That is why you are being investigated.
Edit: I have dug even further into your games, and apparently you had extremely low accuracy before a certain point. This is extremely suspicious, and even more so considering your account is 7 days old.
I have won 77% of my games.