does he have the capacity to end the Israel and Palestine war and the Russia vs Ukraine war which has lasted over two years now and has impacted negatively on the world economy
Short answer: No.
Lets see what each of these conflicts are.
1. Israel wants to wipe out all Palestinians and take 100% of Palestine and then expand and take other countries after Palestine falls (Lebanon, Jordan, Egypt, Most of Turkey, Syria, Iraq, all tiny gas stations like UAE around Persian Gulf, most of Arabia, ...). Neither Trump nor anybody else can put an end to that. The only thing that ends it is dismantlement of this ethno-supremacist Zionist regime.
In other words the armed conflict will not end as long as Israel exists.
2. Considering the fact that Russia is winning and every day they are advancing in Ukraine taking more ground, the only way that can end is for US to recognized all the occupied provinces as part of Russia and accept all other Russian demands such as demilitarization of Ukraine and a lot more.
Although this may change in the future but right now US is not ready to accept any of that and they will continue fighting Russia to the last Ukrainian just like they said it 3 years ago and have been preparing for it ever since early 2010's.
So the pressure on the global economy will continue to exist and if these conflicts expand horizontally (specially the one in West Asia) the impacts will exponentially grow and this time instead of just economic crisis we will see economic collapse.