My first suggestion would be:
Always keep your LI panel full. Even if you are only using 1 halberd (or other weapon) and 1 emblem, that leaves 4 free LI slots to level up "trash LIs". Level them up to max and then deconstruct them. That gives you XP Runes that you can then save up to help level up the LIs you are actively using (especially helpful for max-level, so that you can get a really nice set of LIs and use the runes to automatically level the LIs to the max, instead of having to level them up manually). Also, you can extract a legacy when you do this, so that you can save up legacies and put them on new LIs.
R5 100 GRD Marevayave - Leader of Riddermarked For Death
R8 100 MNS Fayah/100 LM Siennah/100 HNT Dinenol/102 RK Dhurik
100 CHN Alachas/85 CPT Dinfaerien/60 BUR Dhax/35 WDN Godoric
R9 105 MNS Fayeh (alt Wilya) - Lonely Mountain Band @ Landroval