Alternative rating.

I suggest that for tournaments, instead of awarding a fixed number of points only to the prize-winning places, we simply introduce a coefficient for tournament games, which, by the way, would also not be constant, but would be formed based on objective reasons, for example, a prototype of a "pool/conflux".
The magnitude of the coefficient will directly depend on the quantitative and qualitative composition of the players registered for the tournament.
For example, if the average rating of all participants is more than 1600, then the coefficient is 1.5; if it is more than 1700, then it is 2.0 (the tournament is awarded the status of a master-level tournament), and so on. And if, for example, it is less than 1600, then the coefficient = 1.1 and (the tournament is awarded the status of a fan-level tournament).
The numbers are taken from the air (need to be discussed).
P.S. IMHO, the advantages:
+ This provides more incentive to attract players to tournaments.
+ The reward is extended to all participants, not just the winners.