so 10% of the token supply will be used for marketing purposes, I think it's good, as some projects using smaller amounts for marketing
Well, it depends on the project strategy, if they feel they can't handle that much for marketing, it will give big loss impact for their project, especially for their tokens. However, a project have legitimate reason in reserving their tokens for marketing, they won't do it carelessly.
The first thing to deal with this, is provide liquidity in the exchange.
To ensure good liquidity on the exchange, it is necessary to have a good and useful product, advertising and listing on exchanges with good liquidity.