Why not?
1.Replace-By-Fee Replace-by-fee means transactions spending the same coin to the same addresses are not considered double-spends by the network and are still relayed, as long as they pay a higher fee than the preceding transaction.
Example: Alice pays Bob with a coin worth 1 BTC, sending 0.5 BTC to Bob, 0.49995 BTC to herself as change, and 0.00005 BTC to fees. Alice sees that her transaction is quite slow to confirm, so she sends an identical transaction (spending the same coin), but with twice the fee. The network relays the updated transaction and rational miners quickly mine the higher fee transaction.
https://github.com/bitcoin/bips/blob/master/bip-0125.mediawiki2.Child pays for parent (CPFP)Child pays for parent means, as the name implies, that spending an unconfirmed transaction will cause miners to consider confirming the parent transaction in order to get the fees from the child transaction included in the same block.
Is it not possible to use these methods?
How to manually confirm a pending transaction ?
What are the requirements to do it by myself ?
Do I understand correctly, you just need to get confirmation?
If so, then try this service:
https://www.viabtc.com/tools/txaccelerator/