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True about the many competitions Madrid has but if we have to count how many games Joselu will start or play it won't be an impressive number starting from next season and him joining as a supporting striker it seems like he's not even included in the main squad, he should be playing with the Madrid B team if is so. But still on still Madrid isn't a club to be in while you have Mbappe joining as a striker, that's if you're playing same position, you'll find it hard to even make the sub list.
After Real Madrid succeeded in bringing in Mbappe for free from PSG, this will further increase competition on the front lines, he is certain to immediately get a guarantee to fill the main squad. Joselu will be the second option for Real Madrid, he will spend more time on the bench next season. Real Madrid which has a busy schedule, provides a breath of fresh air for Joselu, Ancelotti will rotate in several matches which will give Joselu a playing slot.
Joselu was the hero of Real Madrid victory several times, he managed to change the outcome of the match after playing as a substitute. He is an experienced player, but his age makes it difficult for him to compete with younger players.
If I'm Joselu or I'm to advise him, I will tell him to look for another club this summer. A player like him shouldn't be considered as a second choice. He has the quality to be the main striker in any other club. Just as you have stated above, he has saved real Madrid several times and it was remarkable what he did against Bayern Munich in the semi finals yet he wasn't considered for a starting place in the finals. With the arrival of Mbappe things will get worse for him as he will fall further behind the picking order of Carlos Ancelotti. So if he wants a regular playing time next season he should seek it elsewhere as it's clear enough that his has lost his place in the Madrid squad, unless he want to only be featuring in the Copa del Ray or being brought into play in the 85th minutes and 90 plus. He has got the quality to establish himself elsewhere, so it's left for him to make his choice.