[SOLVED] Migrate PPPOE gateway to LTE (router) how?

[Serius]

The wan connection for my homelab is a plain DSL connection. Now I've accepted the offer of another operator that proposes a LTE internet connection. For that purpose they gave me the LTE router they offer for testing purposes.

As for now, I have a DSL router, in bridge, connected to the main switch and reaches the opnsense machine in my vmware server through a dedicated VLAN.
So I thought, Just bring up another VLAN and port in the switch for the new LTE router. As the router does not accept bridging, deactivate wifi, fw, dhcp, set static ip to 10.0.0.1 and set a DMZ to 10.0.0.2.

In the vmw server I gave another adapter to the opnsense machine tagged for this VLAN, and in opns, I created a new interface to it (call it WAN4G) with static ip 10.0.0.2 and a gateway with ipv4 for 10.0.0.1. I also activated monitoring, that in fact says me that the connection is alive.
But I could not make my router to get internet from this new GW.

Then I went to the failover/balancing documentation and done anything it said about gw groups and fw. So I disconnected my dsl cable and it seemed to switch to the LTE but there was no internet.
PPPOE gw dissapeared anywhere so I can't restablish connection without pulling cables.

If I leave both connected, I can see traffic on the graph for LTE interface but I dont have inet from it (only pppoe) as it "jumps" to lte I loose connectivity. I have to pull the cable of the new router.
Also some strange things occur, like I can't get into the mgmnt web if I'm not in a trunk port. In fact it seems that routing is not working as I can't get into any machine by its dns name or get into the ones that are on different VLAN (I have rules to allow some traffic)
And I can't even ping the own VLAN gateway address.

Can someone tell me how to do this? (to create a new wan connection)

Edit: Solved. Thx for nothing.