I also sometimes use "free" tx accelerator services which basically rebroadcast the transaction everywhere.
which website that use for your tx accelerator? because i usually use tx accelerator with a medium fee and it got confirmed in the next block they mine.
My question is what is the algorithm that a miner picks a transaction from the mempool to include it to a block?
Is it a greedy algorithm which just picks the ones with highest fees? Is the "age" of a transaction in the mempool also a factor? Or is it just a combination of fee and a random choice?
i think the miner includes a transaction with the highest fees first because they got rewarded from the transaction fees that are included in the blocks they mine.
so before you send your transaction make sure you don't use a low fee because it will take days to get confirmed.