There should be no delays in accepting notes, but in the last days we got several spam attacks and many relay tried to filter them, so this may have generated some rejections.
I suggest you to use a client that fully support the Outbox model, pick up a couple of public relays and a paid one with a good spam protection, to try to be visible to those using WoT relays.
Next step: run your own relay.

If can be useful:

nostr:nevent1qqsqqqq32xv7lhdrt2fdsp9za5un2wacaz735zqu0zrdlzeyn0mtk3qpr3mhxue69uhkxmm4de68y6t9wvhxv6tpw34xze3wvdhk6tczypaaaaa7ytwcuk05vq8qgj498gw0jadfm37j0h6cxw780kmcffvq2qcyqqqqqqgva957d