Start of the season he was electric on the wing, then a few niggles coincided with mahrez reaching unbelievable levels and he found himself out of the side. He hasn't really had a run since then to get back in as a certain starter, similar to how stones or laporte couldn't get back in the side over the last 2 seasons.
If he wants to leave then that's a different matter but we have no reason to assume that's the case. even if he remains a bit part player, they have their worth, it's impossible to have a winning squad without bit part players, jesus is different from a lot of our forward players and more than proves his worth to the side every season
He's more than good enough and he's exactly the type of forward we need in certain situations. When Pep wants a high energy game, he turns to jesus. Pep has said numerous times there's no better player on the planet more suited to doing that for him than jesus.