bon j'ai pu résoudre mon problème avec le forum version anglaise
pour info et pour ceux qui ont eu le même soucis que moi
J'ai augmenté les frais à 30sat et ça a été accepté directement \o/
Un peu cher pour une transaction de moi à moi lol mais bon c'est reglé
Merci à vous tous pour votre aide
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The "original transactions" are all the transactions which are currently in the mempool which will be evicted by the replacement. So if the unconfirmed transaction you intended to replace has 5 unconfirmed children, then you must pay a fee higher than the total of all 6 unconfirmed transactions which are to be evicted.
The total size of OP's 4 transactions is 2,933 WU. The total fee paid is 3,891 sats. The combined fee rate therefore is 5.307 sats/vbyte.
To replace the first transaction and evict the other 3 child transactions, his replacement transaction would need to pay a fee of at least 4,031 sats for a 140 vbyte transaction, which would be a rate of 28.8 sats/vbyte.
So I would agree with hosseinimr93, and pay 30 sats/vbyte to be on the safe side.